Acta Phys. -Chim. Sin. ›› 1992, Vol. 8 ›› Issue (05): 630-635.doi: 10.3866/PKU.WHXB19920511

• ARTICLE • Previous Articles     Next Articles

Correlation of Composition、Crystal Structure、Reducibility and Catalytic Oxidation Activity on La-Mn-Ni-O System

Du Shao-Bin; Wang Jin; Ma Fu-Tai; Zheng Hong-Yuan; Lou Hui; Jing Cheng-Heng   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027; Department of Chemistry, Hangzhou University, Hangzhou 310028; Elementary Department, Kunming Engineering College, Kunming 650093
  • Received:1991-03-11 Revised:1991-12-27 Published:1992-10-15
  • Contact: Du Shao-Bin

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Abstract: The correlation of the composition, structure, IR, TPR and catalytic activity for CO and CH_3OH oxidation on LaMn_(1-x)Ni_xO_3 (0.0≤x≤1.0) has been studied. The single crystalline phase was perovskite in the range of 0.0≤x≤1.0; samples for 0.0≤x≤0.4 and x=1.0 were rhombohedral, and cubic with 0.5≤x≤0.8, and the samples with x=0.4 and 0.8 were close to the transitional region of rhombohedral to cubic or cubic to rhombohedral. IR and TPR studies proved that there was interaction between Mn and Ni in the B site of ABO_3. The catalytic activity of the oxides was related to the symmetry of the crystal, the higher the symmetry, the lower the activity.

Key words: Perovskite, Reductive stability, Crystal structure, Symmetry